title: 5-Caffeoylquinic acid and caffeic acid orally administered suppress P-selectin expression on mouse platelets.
abstract: Caffeic acid and 5-caffeoylquinic acid are naturally occurring phenolic acid and its quinic acid ester found in plants. In this article, potential effects of 5-caffeoylquinic acid and caffeic acid on P-selectin expression were investigated due to its significant involvement in platelet activation. First, the effects of 5-caffeoylquinic acid and caffeic acid on cyclooxygenase (COX) enzymes were determined due to their profound involvement in regulating P-selectin expression on platelets. At the concentration of 0.05 microM, 5-caffeoylquinic acid and caffeic acid were both able to inhibit COX-I enzyme activity by 60% (P<.013) and 57% (P<.017), respectively. At the same concentration, 5-caffeoylquinic acid and caffeic acid were also able to inhibit COX-II enzyme activity by 59% (P<.012) and 56% (P<.015), respectively. As expected, 5-caffeoylquinic acid and caffeic acid were correspondingly able to inhibit P-selectin expression on the platelets by 33% (P<.011) and 35% (P<.018), at the concentration of 0.05 microM. In animal studies, 5-caffeoylquinic acid and caffeic acid orally administered to mice were detected as intact forms in the plasma. Also, P-selectin expression was respectively reduced by 21% (P<.016) and 44% (P<.019) in the plasma samples from mice orally administered 5-caffeoylquinic acid (400 microg per 30 g body weight) and caffeic acid (50 microg per 30 g body weight). These data suggest that both 5-caffeoylquinic acid and caffeic acid orally administered can be absorbed and suppress P-selectin expression on mouse platelets.
authors.affiliation: Diet, Genomics, and Immunology Laboratory, BHNRC, ARS, USDA, Beltsville, MD 20705, USA. jae.park@ars.usda.gov
authors.forename: Jae B
authors.initials: JB
authors.lastname: Park
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D002109:Caffeic Acids / Q000008:administration & dosage* / Q000494:pharmacology; D016861:Cyclooxygenase Inhibitors / Q000008:administration & dosage / Q000494:pharmacology; D051379:Mice; D019007:P-Selectin / Q000097:blood*; D011801:Quinic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D002109:Caffeic Acids; D016861:Cyclooxygenase Inhibitors; D019007:P-Selectin; C472707:caffeoylquinic acid; D011801:Quinic Acid; C040048:caffeic acid